浙江大学医学院：胃肠生理学（PPT讲稿）肠胃生理学 Gastrointestinal Physiology

Gastrointestinal Physiology Xia Qiang, MD& phD Department of Physiology Zhejiang University School of Medicine Email:xiaqiang@zju.edu.cn

Gastrointestinal Physiology Xia Qiang, MD & PhD Department of Physiology Zhejiang University School of Medicine Email: xiaqiang@zju.edu.cn

o The MoGraw-Hill Companies, Inc. Permission required for reproduction or salivary Pharr Tache salivary gland Esophagus alive gland Stomach Gallbladder. Pancreas Small testine Cecum Large intestin Rect Anus

Introduction Basic processes of digestion and absorption Propulsion and mixing of food in the alimentary tract Secretory functions of the alimentary tract Digestion and absorption in the gastrointestinal tract

Introduction  Basic processes of digestion and absorption  Propulsion and mixing of food in the alimentary tract  Secretory functions of the alimentary tract  Digestion and absorption in the gastrointestinal tract

Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display Blood flow Liver portal vein Absorption Secretion Anus Food and water Digestion : Fece Esophagus Rectum Motility The four processes carried out by the Gl tract: digestion, secretion, absorption, and motility

The four processes carried out by the GI tract: digestion, secretion, absorption, and motility

Exocrine Mouth an Chewing begins n aton of swa lowing refiex Moisten food Mucus Polysacchande-digesting enzyme Esophagus Lubrication ps Mmo: Many functions in the Pepsins ctein-dg0stng enzymes gut are found in specific sobs sn ion locations along its Dgest carbohydrates, ats. protens, and Neutraaze HCl entering small intestne length. Most of the absorption of nutrients Solubi ?0 water insoluble tats occurs in the small Neutralize HCl entering small intestine intestine, so most of Store and concentrate bee between meals digestion is accomplished there or Small intestine mixing and propusion of contents Enzymes upstream

Many functions in the gut are found in specific locations along its length. Most of the absorption of nutrients occurs in the small intestine, so most of digestion is accomplished there or upstream

Functions of the digestive system Movement: propels food through the digestive system Secretion: release of digestive juices in response to a specific stimulus Digestion: breakdown of food into molecular components small enough to cross the plasma membrane Absorption passage of the molecules into the bodys interior and their passage throughout the body Elimination: removal of undigested food and wastes

Functions of the digestive system ▪ Movement: propels food through the digestive system ▪ Secretion: release of digestive juices in response to a specific stimulus ▪ Digestion: breakdown of food into molecular components small enough to cross the plasma membrane ▪ Absorption: passage of the molecules into the body's interior and their passage throughout the body ▪ Elimination: removal of undigested food and wastes

Anatomy Salivary glands Components of the Oesophagus digestive system Pyl Pancreas Gall bladder Tra answer colon Jejunum

Anatomy: Components of the digestive system

Structure of the alimentary canal Tunics Serosa Muscularis (outer layer) Muscularis〔 Inner Submucosa Mucosa mesentery

Structure of the alimentary canal

Esophagus Stomach Small Large Intestine Intestine